Gymkhana is a term used in the United Kingdom, east coast of the United States, and other English-speaking nations to describe an equestrian event consisting of speed pattern racing and timed games for riders on horses. These events often emphasize children's participation and may be organized by a recognized Pony Club or a 4-H club.

In parts of the western United States, this type of competition is usually called an "O-Mok-See" (also spelled O Mok See or "Omoksee") competition, a term derived from a Native American phrase meaning "games on horseback." However, the term gymkhana is used in California.

Gymkhana and O-Mok-See classes include timed speed events such as barrel racing, keyhole race, keg race (also known as "down and back"), flag race, and pole bending. All of these events are designed to display precise, controlled actions and tight teamwork between horse and rider at speed, although most clubs offer a variety of classes, allowing riders to compete at the speed level they are most capable of, and comfortable with.

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O-Mok-See or Omoksee is the most common term used in the Western United States for events in the sport of pattern horse racing. Most events are run with contestants simultaneously running in 4 separate lanes (3 for small arenas), with each contestant riding in a 30 foot wide lane. The origin of the term "O-Mok-See" is thought to specifically originate with the Blackfeet people where they described a particular style of riding as "oh-mak-see pass-kan" meaning "riding big dance". This event was thought to be a war ceremony; before setting out on a mounted expedition against the enemy, the warriors of the camp performed this dance as a part of the prelude of stirring up courage and enthusiasm for battle. The warriors put on their finest dress costumes, decorated and painted their best horses, carrying their war bundles, shields, lances and bonnets. They mounted and gathered at some distance out of sight of the camp. They turned and rode together at full speed into the great camp circle, circled around it once and then rode to the center of the camp. In the center were a number of old men and women who sang special songs and beat drums for the horsemen. The horsemen then rode their trained horses to the rhythm of the singers and drummers. From time to time the riders dismounted and danced about on foot beside their horses, shooting in the air and shouting to one another to be brave when the battle came. If anyone fell from his horse during the ceremony it was considered an omen of bad luck.

The National Saddle Clubs Association (NSCA) was established in January 1965 as the first national organization of saddle clubs. The NSCA held its first national championship show in 1966. The NSCA has adopted and promotes the sport of "pattern horse racing" under the term O-Mok-See. They encourage and allow the entire family to compete and enjoy horses together. The NSCA has adopted a set of pattern horse racing events for national competition. The organization's competitions emphasize sportsmanship and fair play. Through standardized rules and regulations for pattern horse racing events, the NSCA's prime purpose and objectives are to promote and cultivate cooperation and friendly relationships between saddle clubs throughout the United States.